Manufacture of knife-blades.



No. 689,880. Patented Dec. 3|, l90|. R. HERDER.

MANUFACTURE OF KNIFE BLADES.

I (Application filed June 16, 1899.]

(No Muriel.)

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UNiTien STATES PATENT OFFICE.

ROBERT HERDER, OF OHLIGS, GERMANY.

MANUFACTURE OF KNIFE-BLADES.

SPECIFICATION forming part of Letters Patent No. 689,880, dated December 31, 1901.

Application filed June 16, 1899. Serial No. 720,755. (No model.)

T0 at whom it may concern:

Be it known that I, ROBERT HERDER, a citizen of Germany, and a resident of Ohligs, Rhenish Prussia, Germany, have invented certain new and useful Improvements in the Manufacture of Knife-Blades, of which the following is a specification.

This invention relates to a process of manufacturing knife-blades in a novel and economical manner.

In the accompanying drawings, Figure 1 is a side view of a knife-blade embodying my improvement, and Fig. 2 an end view of the same.

Blades for the inferior qualities of knives are usually made by stamping or punching them out of steel plates which have not been hardened and subsequently hardening and grinding the crude blades or blanks thus obtained. This treatment of the individual blades requires a considerable amount of 1abor and skilled workmanship, in consequence of which the blades could not be made sufficiently cheap. In order to avoid this drawback, I commence by reducing the sheet iron or steel or the bars serving as raw material to the required uniform thickness by passing them between rollers, after which they are hardened, ground or otherwise smoothened, and finally polished, if required. The grinding and finishing of the entire sheet of metal can be eifected easily and cheaply by machinery. From the sheet metal thus prepared the blades are stamped by placing the sheet upon a female die that conforms to the shape of the blade to be severed and is fitted by the male die or plunger. The stamping of the blades may be easily effected, as spring hardened steel is used, which is not liable to crack. After the blades are thus stamped they are sharpened at the edge, no further grinding being required.

In the case of large knives with fiat blades the back of the blade a may be strengthened or stiffened by means of a narrow rail or bar b, fixed to the blade, or the rear edge of the blade may be bent so as to form a flange or stiffening-rib.

What I claim is- The process of producing a knife-blade which consists in reducing a sheet of metal to a uniform thickness,l1ardening and smooth ing it, stamping the blade from the sheet, and sharpening its ed ge,substantially as specified.

Signed by me at Solingen, Germany, this 2d day of June, 1899.

ROBERT IIERDER.

Witnesses:

ERNST KALL, PAUL GRAF. 

